intensity levels are adjustable, the tutorial videos make everything pretty clear, and being a long time lover of track and field i can now run a track in my living room, or relieve frustrations by knocking out a few punching targets (you really get into it, it's pretty funny to watch).
just started the 30-day challenge, so i know there's lots more to come, like for instance basketball which i'm stoked about - definetly worth the money! definetly worth grabbing an extra set of controls (or nunchuks... ) take the chance on it! you won't be dissapointed.
addons and upgrades are being released for the winter holiday season '09/'10.